Cost So Far
$14.5M
Money already spent on the evaluation and cleanup of hazardous sites.
Expected Additional Cost
$800K
The estimated amount of money needed for evaluation and cleanup of hazardous sites at this installation.
Completion Date
2019
The date the DOD says cleanup of all sites was completed. Long term monitoring may continue after this date.
The 2,728-acre site is approximately 30 miles east of San Francisco in Solano County, California. The Benicia Arsenal lies along the eastern flank of the Coast Range geomorphic province. The Sulphur Springs Mountains, north of the Arsenal, are... see more » The 2,728-acre site is approximately 30 miles east of San Francisco in Solano County, California. The Benicia Arsenal lies along the eastern flank of the Coast Range geomorphic province. The Sulphur Springs Mountains, north of the Arsenal, are part of a system of ridges that begin at Benicia and stretch northwest along the eastern side of the Napa Valley. The Arsenal is bounded to the south by the Carquinez Strait. The strait is a narrow, deep channel cut simultaneously with the elevation and folding of the adjacent hills. Geomorphically, the local area varies from the low-lying tidal flats of Suisun Bay's west shore, and rolling hills and steep drainages within the Arsenal, to the 957-foot crest elevation of the Sulphur Springs Mountains less than five miles to the north of the Arsenal. Military munitions were produced or demilitarized at this location and therefore may present an explosive hazard. (Source: U.S. Army Corps of Engineers) « see less
4 Hazardous Sites
Below are the locations of hazardous sites associated with this military installation, according to the DOD. A site’s contamination may affect a much larger area, including public and private lands and the water supplies beneath them.
High Risk
Medium Risk
Low Risk
Risk Not Evaluated or Not Required
Response Complete
We haven't independently confirmed the location of every site. If you notice a site placed at the incorrect location, please contact us.
Not all sites in the DOD data include location information, so there may be sites listed below that are missing from the map. The risk level of a site refers to a relative risk assessment made by the DOD to prioritize the cleanup of sites.
3 Active Sites
Sites where military cleanup actions are still ongoing. The risk level of a site refers to a relative risk assessment made by the DOD, which prioritizes the cleanup of sites that pose greatest threat to safety, human health, and the environment.
Site ID: 01HTRW
HAZARDOUS, TOXIC AND RADIOACTIVE WASTE-01
Landfill
Cost
$32K
Cost in 2015 plus expected future cost of cleanup
Final Cleanup Action
Sep 2019
Contaminated Areas
Soil: High Risk
Stockpiled soil in basement/ TCE 85000 ug/kg Occupants of Bldg 57A
Contaminants: Benzene 0.015 mg/kg 1,2-Dichloroethylene (trans) 0.047 mg/kg 1,2-Dichloroethylene (cis) 5.2 mg/kg Trichloroethylene (TCE) 82.0 mg/kg Lead 6360.0 mg/kg
Groundwater: Medium Risk
Shallow ground water less than 10ft. Groundwater
Contaminants: Lead 3.4 ug/L Benzene 230.0 ug/L 1,2-Dichloroethylene (trans) 270.0 ug/L Vinyl chloride (child/adult) 4600.0 ug/L Trichloroethylene (TCE) 32000.0 ug/L 1,2-Dichloroethylene (cis) 46000.0 ug/L
Sediment (Human): Risk Not Evaluated
Surface Water (Human): Risk Not Evaluated
Site ID: 05PRP/HTRW
TCE-PLUME
Unknown Site Type
Cost
$112K
Cost in 2015 plus expected future cost of cleanup
Final Cleanup Action
Sep 2017
Site ID: 04CON/HTRW
TANK INVESTIGATION AND REMOVALS
Site Not Recommended For Action
Cost
Unknown
1 Inactive Site
Sites where military cleanup actions are complete, according to the DOD. Note that this status does not necessarily mean the site is no longer hazardous, as many of these sites are put under long-term monitoring or other restrictions.
Site ID: 02OEW
ASR COMPLETE
Unexploded Munitions and Ordnance Area
Cost
$722K
Cost in 2015 plus expected future cost of cleanup
Final Cleanup Action
Sep 2003
This site is under ongoing monitoring until Sep 2055
Update (Dec. 5, 2017): We have changed the source of the installation cost data after being notified by the Department of Defense that they erroneously reported their own cost figures on the DERP website. We are now displaying the costs the department says are the most accurate available, from the Pentagon’s DERP database that we received in a FOIA request.
Note: The risk level of a site refers to a relative risk assessment made by the DOD to prioritize the cleanup of sites.
Data: All data comes from the Defense Environmental Restoration Program and the U.S. Army Corps of Engineers, and will be released soon at the ProPublica Data Store. Read our methodology »